Microsoft sales execs like nice, round numbers, like $1 billion. So it's little wonder that these officials tend to look at budding businesses in terms of their potential to join Redmond's $1 billion business club.

There are already more than a dozen distinct products/services generating more than $1 billion a year in sales at the company. Those include Windows, Office, Xbox, SQL Server; System Center; Unified Communications; SharePoint; Developer Tools; Dynamics (ERP & CRM); and Online display and search advertising. SharePoint actually crossed the $2 billion a year threshold in 2012.

So where does Microsoft's sales team see the next potential billion-dollar contributors? A January 2013 job post on the Microsoft Careers site for the Sales, Marketing & Services Group (SMSG) Incubation sales team -- the group "accountable for building the next billion dollar businesses for Microsoft" -- includes these products and services on the list: